Steam-valve



No. 6|4,3||. Patented Nov. I5, |898. P. SCHUEN.

STEAM VALVE.

(Application filed Nov. 29, 1897.;

iNo Modem UNITED STATES PATENT Clinics.

PETER SCI'IOEN, OF ALLEGHENY, PENNSYLVANIA.

STEAM-VALVE.

SPECIFICATION forming part of Letters Patent No. 614,311, dated November 15, 1898.

Application filed November 29 1897. Serial No. 660,086. (No model.)

T0 @ZZ whom it may concern:

Be it known that l, PETER ScHoEN, a citizen of the United States of America, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Steam or Air Valves, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in valves, and relates particularly to that class of valves employed on steam-engines and the like.

The invention aims to construct a valve of this nature wherein the ordinary steam-chest will be dispensed with, and in lieu of the ordinary slide-valve employed to move longitudinally through the steam-chest and alternately open and close the steam-ports I provide a valve having a rotary motion.

The invention further aims to construct a valve which may be arranged, if desired, with a pressure-cylinder communicating with the port which serves the purpose of the steam-Y chest, and it further aims to provide means for cushioning the piston operating in the steam-cylinder.

In describing the invention in detail reference is had to the accompanying drawings, forming a part of this specication, and wherein like letters of reference indicate similar part-s throughout the several views,in which- Figure lis alongitudinal sectional view of a portion of a cylinder with my improved valve in cross-section. Fig. 2 is a sectional view on line X X of Fig. 1, the pressure-cylinder being removed. Fig. 3 is a perspective view of the cylinders and valve arranged thereon, the latter being partly broken away. Fig. 4t is a side view of the valve. Fig. 5 is a cross-sectional view of the same, and Fig. 6 is a perspective view.

Referring now to the drawings by referenceletters, Ct indicates an ordinary steam-cylinder, and b a steam-chest secured thereto in the ordinary manner. The cylinder is provided with the ordinary exhaust-port c and with the auxiliary ports d d', these latter opening into the steam-passages e e' to each end of the cylinder.

Within the steam chest or casing b is arranged an auxiliary chest or casing b', which is provided with openings b2, b3, and b4 at its base and which rests upon the iianges f, provided therefor on the cylindercasing. This auxiliary casing or chest is provided at its top with a port g, communicating with the port g between the two casings. The outer casing b is also provided with a port g2 directly above the port g, to which is connected a pressure-cylinder g3, that is or may be provided with a removable cap g4 on its top.

Arranged within the auxiliary casing b is the valve h, cylindrical in form, and which is fitted neatly within the said casing b'. This valve is provided on its one end with a stem h', which protrudes through the end of the casing b and has secured to its end the crank h2, to which the valve-stem is attached for operating the valve. This valve h is provided with a longitudinal openin g h3, by which the steam is admitted to its central opening h4 from the port g. The valve is also provided along its underneath side with a groove 7c, communicating with the exhaustport c and from which the steam is exhausted at its outlet-port c. Longitudinal openings 7c k2 are provided in the valve h, these being of the same length as the larger opening h5, and they communicate with the ports d and d', by which steam is admitted to the ports c and e to the cylinder. arranged as to register alternately with the ports d and d' as the valve is reversed and the intervening spaces of the valve between the said openings and the groove in its underneath side, and which forms a port of the exhaust, thus forms the top of the valve by which the aforesaid openings are alternately opened and closed.

The steam is admitted into the chest 01 port g and passed through the port g, opening h3, into the valve, from which point (providing the ports 7o and d register) it passes to the port e and into the cylinder. If, however, the valve is reversed and the ports 7a2 and d register, the port d is closed and the steam passes through the port e to the cylinder at the opposite end from that by which it passed through the port e. As the lap of the valve passes oft the ports d or d to open the same it will be observed that only one-half of the port d or d is opened, at which time the piston has traveled one-half its distance Within These openings lo k2 are so IOC) the cylinder, its' movement in the one direction being completed when the valve is reversed and the lap thereof is repassing over the port cl or d', as the case may be.

By rotating the valve h an absolute cut-off? of the steam is accomplished and the ports are alternately opened and closed with a precision and regularity not accomplished with the ordinary slide-valve.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is'- In a rotary Valve, a steam-chest, a pressure-cylinder secured to said steam-ch est and communicating therewith, an auxiliary chest or casing arranged within said steam-chest and provided with a series of openings, said auxiliary chest or casing being suitably secured to flanges carried by the cylinder-casing and being provided at its top with an opening registering with an opening in said pressure-cylinder, a rotary valve arranged Within said auxiliary chest or cylinder, and carrying on one end a stem, said stem protruding through the end of the steam-chest,

a longitudinal opening h3 formed in the t0p- PETER SCIIOEN.

W'itnesses:

JOHN NOLAND, WILLIAM E. MINOR. 

